Why do you think most transportation in the U. S. is still running on fossil fuels?

because they are always available

Explanation:

so we use them

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

answer; i believe that the correct answer is (lung);